3- A security alarm system is activated and deactivated by correctly entering ap

Question

3- A security alarm system is activated and deactivated by correctly entering appropriate t digit numerical code in the proper sequence in a digital panel. a) Compute the total number of possible code combination if no digit maybe used twice. b) Compute the total number of possible code combination if two digits maybe used more than once. 4 a) Describe the empirical Rule and The Chebyshev's Rule b) In a mound-shaped, symmetric distribution, draw a graph and mark the mean, median and mode. Compare the locations if the distribution is skewed to the left or right.

Explanation / Answer

Answer :

3 ) a) as the number is 3 digit and repetition of digits is not allowed , so number of possible codes = 10*9*8 = 720

B) two digits are allowed to be used more than when all digits are used once + codes when those two digits are used twice + codes when those two digits are used thrice = 10*9*8 + 2*3*9 + 2 = 720 + 54 + 2 = 776

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